This should play all your games at ultra
I have a 7870 and it plays like a dream.
PCPartPicker part list:
http://uk.pcpartpicker.com/p/IDyr
Price breakdown by merchant: http://uk.pcpartpicker.com/p/IDyr/by_merchant/
Benchmarks: http://uk.pcpartpicker.com/p/IDyr/benchmarks/
CPU: AMD FX-6300 3.5GHz 6-Core Processor (£99.59 @ Aria PC)
Motherboard: MSI 970A-G46 ATX AM3+ Motherboard (£47.94 @ Aria PC)
Memory: Crucial 8GB (2 x 4GB) DDR3-1600 Memory (£32.70 @ Dabs)
Storage: Western Digital Caviar Blue 160GB 3.5" 7200RPM Internal Hard Drive (£22.95 @ Amazon UK)
Video Card: XFX Radeon HD 7870 2GB Video Card (£168.95 @ Aria PC)
Case: NZXT Source 210 (White) ATX Mid Tower Case (£31.18 @ Scan.co.uk)
Power Supply: XFX 550W 80 PLUS Bronze Certified ATX12V / EPS12V Power Supply (£46.79 @ Aria PC)
Optical Drive: Lite-On iHAS124-04 DVD/CD Writer (£11.45 @ Amazon UK)
Total: £461.55
(Prices include shipping, taxes, and discounts when available.)
(Generated by PCPartPicker 2013-03-10 00:08 GMT+0000)